audinfo.cpp
上传用户:dangjiwu
上传日期:2013-07-19
资源大小:42019k
文件大小:5k
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #include "hlxclib/string.h"
- #include "hxtypes.h"
- #include "audinfo.h"
- CAudioInfoBase::CAudioInfoBase()
- : m_ySyncWord(0),
- m_bIsInited(0)
- {
- }
- CAudioInfoBase::~CAudioInfoBase()
- {
- }
- BOOL CAudioInfoBase::IsInited()
- {
- return m_bIsInited;
- }
- INT16 CAudioInfoBase::GetSyncWord()
- {
- return m_ySyncWord;
- }
- UINT32 CAudioInfoBase::GetAudioRtpPacket(UINT8 *pRead,
- UINT32 ulRead,
- tRtpPacket *pRtp)
- {
- UINT8 bCont = 1,
- *pStart = pRead,
- *pCopy = pRead,
- *pLastFrame = NULL;
- UINT32 ulBytes = ulRead,
- ulFrameSize = 0;
- pRtp->ulHeaderSize = 4;
- // Finish fragmented packet
- if (pRtp->bPacketFrag)
- {
- if (ulRead >= pRtp->ulFragBytesRem)
- {
- // Set offset header
- pRtp->aHeader[3] = (pRtp->wFragBytes & 0xFF00)>>8;
- pRtp->aHeader[4] = pRtp->wFragBytes & 0x00FF;
- pRtp->bPacketReady = 1;
- pRtp->bPacketFrag = 0;
- pRtp->wFragBytes = 0;
-
- ulBytes = pRtp->ulFragBytesRem;
- pRtp->ulFragBytesRem = 0;
- return ulBytes;
- }
- else
- return 0;
- }
-
- while (bCont)
- {
- ulFrameSize = (UINT32)CheckValidFrame(pRead, ulRead);
- // Check for space in our rtp packet
- if (ulFrameSize > pRtp->ulBytesFree)
- {
- // The frame is bigger than our rtp packet size
- if (!pRtp->ulDataChunks)
- {
- pRtp->bPacketFrag = 1;
- // Set rtp packet to max size (send as much of
- // the slice as we can).
- pRead += pRtp->ulBytesFree;
- pRtp->wFragBytes = (INT16)(pRead - pStart);
- pRtp->ulFragBytesRem = ulFrameSize - pRtp->wFragBytes;
- }
- pRtp->bPacketReady = 1;
- bCont = 0;
- }
- else if (ulFrameSize)
- {
- pLastFrame = pRead;
- ++pRtp->ulDataChunks;
- pRead += ulFrameSize;
- ulRead -= ulFrameSize;
- pRtp->ulBytesFree -= ulFrameSize;
- }
- else
- {
- if (pRtp->ulDataChunks)
- {
- pRtp->bPacketReady = 1;
- bCont = 0;
- }
- // On a seek, we need to find an audio frame
- else
- {
- int nFrameSize = 0;
- INT32 lScan = 0;
- lScan = ScanForSyncWord(pRead, ulRead, nFrameSize);
- if (lScan >= 0)
- {
- pRead += lScan;
- ulRead -= lScan;
- }
- else
- {
- bCont = 0;
- }
- }
- }
- }
- ulBytes = (UINT32)(pRead - pStart);
- // Bump scr and pts
- if (!pRtp->bPacketReady)
- {
- memset(pRtp->aHeader, 0, sizeof(pRtp->aHeader));
- pRtp->bPacketReady = 0;
- pRtp->ulHeaders = 0;
- pRtp->ulDataChunks = 0;
- pRtp->ulBytesFree = RTP_PACKET_SIZE;
- }
- return ulBytes;
- }